Lathe-dog



(No Modell) J' E' WNTZ.

LATER DOG.

No. 512,997. PatentedJan. 16, 1894.

vk Ilm W NITED STATES PATENT OFFICE@ JACOB FREDERICK wENTZ, oF'sANnusKYyoH-Io.

LATH E'- DOG.

SPECIFICATION forming part of Letters Patent No. 512,997, dated January 16, 1894.

Application letl December 9, 1892:

To all whom t may concern:

Be it known that l, JACOB FREDERICK VVENTZ, of Sandusky, county of Erie, and State of Ohio, have invented certain new and useful Improvements in Lathe-Dogs, of which the following is a specification, reference being had to the accompanying drawings.

The object of my invention is to produce a lathe dog adapted to be used upon the face plate of a lathe, and to'positively grip work of Adifferent thicknesses, and of different lengths of center.

In the accompanying drawings, Figure 1 is a side elevation of my dog applied to a lathe plate. Fig. 2 is a view of the dog detached, showing the movable arm separated. Fig. 3 is a side elevation of a moditled,form of my invention, showing what I call center adjustment. Fig. 4 is a central longitudinal section of the device shown in Fig. 3.

Referring to the figures on the drawings, l

indicates a lathe face plate. p 2 indicates the base-plate of a dog, Which 1s connected with a fixed arm 3 by an intermediate plate 4, which, in the simpler form shown in Figs. 1, 2, and 3 of the drawings, is preferably inclined, as illustrated.

5 indicates a longitudinal slot in the baseplate of the dog, through which a' bolt 6 is passed for adj ustably securing it to the faceplate. a

i 7 indicates a movable arm provided with a right angular extension 8, which is adapted to lit closely and slide within a transverse groove 9 above the end of the intermediate plate. The angular extension of the arm is preferably provided with apluralityof screw-threaded holes 10, into which a tap-.bolt 11 is en`` tered. This tap-bolt preferably sets upon a straight sided washer 12, and passes through a transverse slot 13 corresponding in direction to the groove 9. The purpose of the plu.- rality of holes in the extension of the movable arm is to afford different maximum and minimum limits for the adjustment of the dog; while that of the slotis to `afford all degrecs of adjustment within those limits. For

example if the tap bolt were set in the hole next to the movable arm the adj ustmentwould be from zero to three-fourths of an inch, if in Serial No. 454,576- (No model.)

the next hole it would be from three-fourths of an inch to an inch and a half, and so on. For securing a closer and Iirmer union of the movable arm in any fixed position I prefer to employ correlative corrugations in the bottom of the groove, and Vupon the angular extension of the movable arml,'substantially as illustrated. The movable and fixed arms with their intermediate adjustment mechanism constitute a preferable form of clamp; but my invention broadly consists in this particular in a lathe dog having any suitable form of clamp carried in a different plane from the base-plate, and preferably parallel therewith.

In Figs. 3 and 4 of the drawings I have illustrated whatl prefer to call a center adjustment; that is, an adjustment for taking hold of the work at dierent distances from the face-plate center. For this purpose I prefer toy set the intermediate plate at right angles to the base-plate, and provide in the face of the former a groove or channel 14, into which is adapted to'iit the projecting face 15 of an intermediate adjustment plate 16. The intermediate plate and the intermediate adj ustment plate are adjustably united by a tapbolt 18 passing through a slot 19, and enterl ing a hole 20 in the intermediate adjustment plate. n

It is obvious that the relative arrangement of slots and bolt-holes in the matter of adjustment is purely arbitrary, and maybe changed or reversed at will.

In practice my device is preferably made entirely of steel, the base-plate, intermediate plate, and fixed arm being preferably formed integral in the construction shown in Figs. 1 to 3 inclusive of the drawings.

In Figs. 3 and 4 the intermediate plate is,

as it were, dividedto form the intermediate adjustment plate,and admit of the center adjustment. In other'respects the relations of the, parts are unchanged.

What I claim is 1. In a lathe dog, the combinationwith a base plate, intermediate plate and vertical extension provided with a longitudinal groove,

and transverse slot, and a iixed arm, of a `r movablev arm and angular extension thereof, said angular extension being provided with bolt holes, and a taip bolt adapted to ,pass justable thereon, substantially as and for the thronghthe .transverse slottand `to enter a purposefspefied lo hole in the angular extension of the movable In testimony of all which I "have "hereunto arm, substantially as and for the purpose subscribed my name.

5 specied. JACOB FREDERICK WENTZ.

2. In a. lathe dog, the combination with ay Witnesses: t base plate and aan tinterfmdiate plate,of ,am LJ. EEI'X,

intermediate adjustment plate and clamp, ad- J. ERCKENER. 

